Adjustable window grille



FIG. 1 is a perspective view of an adjustable window grille showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front elevatioanl view with the rear elevational view being a mirror image thereof;

FIG. 4 is a left side elevational view with the right side being a mirror image thereof; and,

FIG. 5 is a bottom view thereof.

The broken line showing a window casing and hinge that can be used to mount the adjustable window grille are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an adjustable window grille, as shown and described. 